Health district officials in Reno and Carson City are closely monitoring air quality concerns after a smoky haze sent the quality level into the "unhealthy" zone Thursday.

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10:20 p.m. update

The American Fire has grown to 5,420 acres, the U.S. Forest Service reports. One mining structure was destroyed and two minor injuries are reported since the fire started Saturday. Containment stands at 35 percent.6:20 p.m. update

The heavy fuels are creating large amounts of smoke, U.S. Forest Service officials said in a news release Thursday. "An air quality warning has been issued for Placer county. Those planning to visit area campgrounds and other recreation sites may experience intermittent heavy smoke. Smoky conditions may last for several days." ...